asp.net edit command field with css and image

 <asp:CommandField ButtonType="Image" EditText="Edit" EditImageUrl="~/images/Edit.jpg"
                            HeaderStyle-CssClass="centerText" ItemStyle-CssClass="centerText" ControlStyle-CssClass="editIconSize"
                            HeaderText="Edit" ShowEditButton="True" ShowCancelButton="false" UpdateImageUrl="~/images/save.jpg" />